Jan Null, CCM
@ggweather.bsky.social
SF Bay Area meteorologist for five decades, first as an NWS forecaster and then as founder of Golden Gate Weather Services. Serious amateur photographer.
Friday night #GreenFlash over Half Moon Bay. 12/12/2025
December 13, 2025 at 1:30 AM
Friday night #GreenFlash over Half Moon Bay. 12/12/2025
For, at least us older, meteorologists, December 12, 1995, serves as a benchmark for strong Bay Area storms. It ranks #1 going back 75 years to 1950, on the Bay Area Storm Index (BASI) ggweather.com/basi.htm.
December 12, 2025 at 9:50 PM
For, at least us older, meteorologists, December 12, 1995, serves as a benchmark for strong Bay Area storms. It ranks #1 going back 75 years to 1950, on the Bay Area Storm Index (BASI) ggweather.com/basi.htm.
The great footprint of fog continues in the Central Valley and into its adjacent valleys. Some of the extended range models are beginning to lock onto some changes about a week out, but that outlook is still as murky as the visibilities. 12/12/2025
December 12, 2025 at 6:37 PM
The great footprint of fog continues in the Central Valley and into its adjacent valleys. Some of the extended range models are beginning to lock onto some changes about a week out, but that outlook is still as murky as the visibilities. 12/12/2025
A couple of shots of our local Great Blue Heron, "Brian", doing some midday foraging amongst the oxalis.
December 11, 2025 at 8:42 PM
A couple of shots of our local Great Blue Heron, "Brian", doing some midday foraging amongst the oxalis.
This morning's predawn "half moon" over Half Moon Bay. (Technically, it's the third, or last, quarter waning moon). 12/11/2025
December 11, 2025 at 3:19 PM
This morning's predawn "half moon" over Half Moon Bay. (Technically, it's the third, or last, quarter waning moon). 12/11/2025
An elevated blip of "Blue Flash" above the offshore stratus layer. Half Moon Bay.
December 9, 2025 at 1:51 AM
An elevated blip of "Blue Flash" above the offshore stratus layer. Half Moon Bay.
A sublime Saturday sunset at Pigeon Point Light Station State Historic Park, 12/6/2025
December 7, 2025 at 1:43 AM
A sublime Saturday sunset at Pigeon Point Light Station State Historic Park, 12/6/2025
It's been 15 days without rain in San Francisco, when 0.26" was recorded on Nov 20th. With good agreement in the forecast models that there will be no rain for at least another 10 days, here are other extended periods of dry weather in San Francisco of ≥25 days beginning in Nov.
December 5, 2025 at 2:28 PM
It's been 15 days without rain in San Francisco, when 0.26" was recorded on Nov 20th. With good agreement in the forecast models that there will be no rain for at least another 10 days, here are other extended periods of dry weather in San Francisco of ≥25 days beginning in Nov.
Full moon rising!
December 5, 2025 at 2:00 AM
Full moon rising!
The latest Oceanic Niño Index, for Sep-Oct-Nov, shows values dipping into weak La Niña territory. However, forecasts show this to be fairly short-lived, and like last year probably not long enough to go into the books as a "historic" La Niña. More ENSO related data at ggweather.com/enso.htm
December 4, 2025 at 7:01 PM
The latest Oceanic Niño Index, for Sep-Oct-Nov, shows values dipping into weak La Niña territory. However, forecasts show this to be fairly short-lived, and like last year probably not long enough to go into the books as a "historic" La Niña. More ENSO related data at ggweather.com/enso.htm
A wave framed sunset in Half Moon Bay.
December 4, 2025 at 4:38 AM
A wave framed sunset in Half Moon Bay.
Predawn color at Pillar Point Harbor. (sound on) 12/3/2025
December 3, 2025 at 3:59 PM
Predawn color at Pillar Point Harbor. (sound on) 12/3/2025
A rainbow snowcone sunset getting photobombed by a low-flying pelican. half Moon Bay. 12/01/2025
December 2, 2025 at 1:45 AM
A rainbow snowcone sunset getting photobombed by a low-flying pelican. half Moon Bay. 12/01/2025
To go along with the statewide data, here is the individualized data for San Francisco and Sacramento, and the important 3 Sierra Indices.
December 1, 2025 at 4:20 PM
To go along with the statewide data, here is the individualized data for San Francisco and Sacramento, and the important 3 Sierra Indices.
Percent of normal for the season to date from ggweather.com/seasonal_rai...
December 1, 2025 at 3:42 PM
Percent of normal for the season to date from ggweather.com/seasonal_rai...
A sublime Sunday sunrise at Whaler's Cove, on the south side of Pigeon Point. (sound on)
November 30, 2025 at 3:50 PM
A sublime Sunday sunrise at Whaler's Cove, on the south side of Pigeon Point. (sound on)
Just a bit of sunrise color upon calm waters. 11/29/2025
November 29, 2025 at 3:14 PM
Just a bit of sunrise color upon calm waters. 11/29/2025
Escapees? A couple wild turkeys in the hills above Pescadero on the run. 😊
November 27, 2025 at 3:18 PM
Escapees? A couple wild turkeys in the hills above Pescadero on the run. 😊
Here is this morning's image of the "footprint" of Tule Fog in the Central Valley and adjacent valleys. Similar conditions, with low visibilities, are expected tomorrow. Please slow down and give yourself extra time to get to your destimations safely.
November 27, 2025 at 12:41 AM
Here is this morning's image of the "footprint" of Tule Fog in the Central Valley and adjacent valleys. Similar conditions, with low visibilities, are expected tomorrow. Please slow down and give yourself extra time to get to your destimations safely.
Just the 28% waxing crescent moon picking up a hint of rosy color from the setting sun. 11/25/2025
November 26, 2025 at 2:17 AM
Just the 28% waxing crescent moon picking up a hint of rosy color from the setting sun. 11/25/2025
Surfers and spindrift at Steamers in Sana Cruz. 11/23/2025
November 24, 2025 at 2:32 AM
Surfers and spindrift at Steamers in Sana Cruz. 11/23/2025
here's the 9am vis pix.
November 22, 2025 at 5:11 PM
here's the 9am vis pix.
Tule fog (i.e., radiation fog) forming in the Delta and the west side of the Sac and San Joaquin Vlys from the perfect recipe of moist ground, clear skies and light winds. Note the "curl" in the fog (top center) as the Sutter Butters protrude above. (6:36 am pst, GOES NT-Physics)
November 22, 2025 at 2:53 PM
Tule fog (i.e., radiation fog) forming in the Delta and the west side of the Sac and San Joaquin Vlys from the perfect recipe of moist ground, clear skies and light winds. Note the "curl" in the fog (top center) as the Sutter Butters protrude above. (6:36 am pst, GOES NT-Physics)
A tiny (3%) sliver of the crescent moon above the Pillar Point radome.
November 22, 2025 at 4:51 AM
A tiny (3%) sliver of the crescent moon above the Pillar Point radome.